Blog Stats

IOS programming

The only peripheral ID that Core Bluetooth API offers after discovery is CBPeripheral.identifier.

Not MAC address.
You can’t get MAC address via Core Bluetooth. There is no public API for this. If this is an internal or jailbreak application you can get the value of the kLockdownBluetoothAddressKey key via liblockdown.dylib.

identifier has been moved to CBPeer class, which is base class of CBPeripheral. So net effect is the same.

A different central will return a different id for the same peripheral.

A central will return the same id for a peripheral. Thus, it can be stored and used later per Apple doc.
However, I don’t know how long it will return the same id.
Important: assuming the peripheral doesn’t use Bluetooth 4.0 Privacy feature, which changes its ID periodically.

After extensive testing, I found a big IOS external accessory bug in iOS 5.x.x – 6.1.2 detailed below.
I submitted the bug to Apple and got confirmation that they are aware of it but they can’t share anymore detail. A fix may be in next version! Standard Apple secret procedure.

Alarm-based interruption occurs (displayed in an alert dialog) Notes: Starting IOS 5 with notification center, apps with notifications such as SMS, Calender, Reminders… can be configured to ‘Alert Style’ in Settings \ Notifications. If the app is configured as such, it will cause applicationWillResignActive event to fire when there is a notifition; otherwise, applicationWillResignActive event will not be fired.

Notes: UIApplicationExitsOnSuspend flag does affect the behavior of applicationWillResignActive event.

IOS’s applicationDidEnterBackground event is fired when:

single click the home button

phone call if user picks up

pulling down notification center (IOS 5+) & click on an notification to launch an app

double click the home button & select a different app

user turns off via power button (only if UIApplicationExitsOnSuspend=NO)

screen is turned off by auto-lock (only if UIApplicationExitsOnSuspend=NO)